A slit of width 'a' is illuminated by red light of wavelength 6500 Å. If the first difraction minimum falls at 30°, then the value of 'a' is --------

Question

$6.5 \times 10^{-4} \, \text{mm}$

1.3 micron

3250 Å

$2.6 \times 10^{-4} \, \text{cm}$

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